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What is the action of this muscle?, What term describes the more movable end of a muscle? and more. Study with Quizlet and memorize flashcards containing terms like What happens to the fibers of muscles whose motor neurons have been severed?, Consider a muscle that originates on the anterior forearm and inserts on the palm of the hand.
The anterior end of the neural tube develops into the brain, and the posterior region becomes the spinal cord. Tissues at the edges of the neural groove, when it closes off, are called the neural crest and migrate through the embryo to give rise to PNS structures as well as some non-nervous tissues.
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
The two cell divisions are called meiosis I and meiosis II. Meiosis I begins after DNA replicates during interphase. Meiosis II follows meiosis I without DNA replicating again. Both meiosis I and meiosis II occur in four phases, called prophase, metaphase, anaphase, and telophase.
- Prophase I
- Prometaphase I
- Metaphase I
Early in prophase I, the chromosomes can be seen clearly microscopically. As the nuclear envelope begins to break down, the proteins associated with homologous chromosomes bring the pair close to each other. The tight pairing of the homologous chromosomes is called synapsis(Figure 2). In synapsis, the genes on the chromatids of the homologous chrom...
The key event in prometaphase I is the attachment of the spindle fiber microtubules to the kinetochore proteins at the centromeres. Kinetochore proteins are multiprotein complexes that bind the centromeres of a chromosome to the microtubules of the mitotic spindle. Microtubules grow from centrosomes placed at opposite poles of the cell. The microtu...
During metaphase I, the homologous chromosomes are arranged in the center of the cell with the kinetochores facing opposite poles. The orientation of each pair of homologous chromosomes at the center of the cell is random. This randomness, called independent assortment, is the physical basis for the generation of the second form of genetic variatio...
The primitive gut originates from entoderm at the time of its flexion. The yolk sac constricts, thus the intraembryonic entoderm (future digestive tube) and the extraembryonic entoderm (forms the inner lining of the yolk sac) are delineated.
If it originates with the doer, this leads to an unending chain of preponderants, as the occurrence of each preponderant must be preceded by another preponderant.
Some common synonyms of preponderant are dominant, paramount, and predominant. While all these words mean "superior to all others in influence or importance," preponderant applies to an element or factor that outweighs all others in influence or effect. preponderant evidence in her favor.
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